Folding and extension trestle



(No Model.)

G. HANSS'EN.

FOLDING AND EXTENSION TRESTLE.

No. 318,896. Patented May 26, 1885.

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theirs trarne arent Ottica@ GUSIAV HANSSEN, OF ST. LOUIS, MISSOURI.

FOLDING AND EXTENSlON TRESTLEl rlPI-CIFICATION forming part of LettersPatent No. 318,896, dated May 26, 1885.

Application filed February 12, H85. (No model.)

To @ZZ whom t may concern.-

Be it known that I, Gusrnv HnNssnN, a citizen of the United States,residing at 1302 Arsenal street, in the city of St. Louis, inthe Stateof Missouri, have invented a new and useful Folding and ExtensionTrestle, of which the following is a specification.

)Iy invention relates to a trestle which can be easily folded fortransportation or storage, quickly adjusted for use, and easilyextended. These objects I attain by the mechanism demonstrated by theannexed drawings.

Figure I is a cross-section of the upper part of the trestle. a.indicates the casting into which the trestle-beani o is placed. It, u,has on each side a socket or inlet, into which the castings b and b (theends of the trestle-supporters c and c) are forced and held 1n positionby the bolts or fasteners d and d, d and d each running through atrestle-supporter, c or c, and maintaining or holding both b and b and cand c in position. e acts as center bolt and fastener, holding the wholetogether, and is also the pivot or axle on which the legs c and c Inovcwhen being adjusted.

Fig. II shows the end view of the trestlein position, the supporters cand @,with ends of b and b in sockets of a., maintained by the centerbolt, c, the opening of the hinge-brace j', the extension g and g and cand c controlled, regulated, or maintained by the sliding clamps h and7a. in connection wit-h the clamp-sockets p and p, together with theclamps v and yi, and adjusted by the brakes j andj.

Fig. III represents the side view, demonstrating by the arrows L'. and Zand m and n how the trestlc may be folded or unfolded after the adjustincnt of the hingebrace f for ready use, storage, or transportation,as exhibited in Fig. IV.

The trestlc can be constructed of different materials. n, b, f, and jcan be constructed of cast or otheriron; (1,6, It, t', andgofwroughtiron; c, g, and o of wood or iron. The whole may be constructedof any size to suit.

c is a casting longer than wide-in this case six inches long by two andonehalf wide by four and one-fourth high-with a tubular socket for thebolt or axle e. It is also formed with a cut or notch two by four andsixinches long for the beani o, and two half-inch holes at the ends ofthe bottoni to insert bolts q q, which fasten the beam to a, withprojections r and r, of three-eighths of an inch on each side, formingthe inlets forthe slices b and b.

Z and b arclonger cast-shoes of beveled shape at the upper end, threeinches wide, (which lit into inlets formed by o* and 13) into which cand c, the supports or legs, are inserted and fastened by bolts d d,having been first secured by means of the axle-bolt e to u. Thissecuring is accomplished by inserting t and b on each side of ce ontothe ends of the axle e, then riveting the ends of c in such a mannerthat b and b have sonic play on e sufficient to enable the folding andunfolding and securing of the trestle.

c and c are supports, and inust correspond in length to the height ofthe trestle desired, (are in this description two by three inchesf) withnotches p p for h and h to anchor into at regular intervals, upper endto fit closely into the shoes l) and I), held in position by bolt d.

d and d. are nut bolts inserted below c through l) and b and c and c,and holding them together, as already explained.

c is an axle, the body of which is tirinly enibedded in a below thenotch for o, the ends of e projecting and forming axles, onto whichshoes b and b are placed, and the ends of care then riveted, so as tohold Z and with play, as stated.

f is a hingc-brace (joint) fastened to the lower ends of c and c, theopening of which forces Z) and b against rivets of e and into the inletsformed by o* and r, securing two iirni supports. The closing of thebrace enables the folding by bringing about the reverse action.

g and g are the outer supports or additions to the supports c and c,enabling the easy extension of the trestlc. They are of t-he sa me shapeand dimension of c and c, are held and moved up and down the outer sidesof c and c, regulated by the clamps h and It fastened'to their ripperends, andare held in the designed position by means of It and Itanchoring into the sockets p andp in c and c and by the closing of thebrakes j and j.

and@ are two clamps held to the lower ends ofc and c by the saniefastenings as f, and in which g and g slide up and down when thc trestleis extended or shortened.

and j are two cani -shaped brakes with handles, attached to the clampstand 1i. Then the handle is turned upward, they permit g or g to slide upor down c c. Vhen the handle is turned downward, g or, g is held firmlyto c or c.

7c and Z and m and n on the drawings are an rows, showing the motion ofthe supports g g and c c in opening and folding the trestle.

o is the beam ofthe trestle, in the drawings two by four inches, lengthto suit, the ends of which are inserted into the notch of the castingct, and held in position by two nut-bolts, q and g, at each end, runningthrough it, and c in each notch of a.

p and p are sockets cut into the supports e and c sufficient to catchand anchor h and 71.

q are four bolts holding o at each end in the notch of a, as described,size to suit o and notch in a, as the same may be cast.

o and r are projections cast onto the outside of a near the upper edge,and on each side forming inlets,eorrespondng in width to Z1 and b,answering the double purpose of supporting and preventing swaying of thetrestle in connection with f, as described.

As will be seen by the above, the trestle is folded by first closing fin each ofthe supports. rIhis draws c g and c g toward each other, andat the same time draws the shoes b b out of the inlets formedbyrr.Thelegs can then be swung on the axle e. One pair of the supports isthen moved inward and up (m and n in fli'g. III) to the beam o, theother outward and over (It and Z in Fig. III) onto the beam o, when thetrestle is folded as in Fig. IV. The trestle is lowered by opening thebrakes j and j and raising the clamps h and h out of the sockets pp,then slid- 'ing g and g up along c and c; is raised by the ing movementto permit them to be folded 5o compactly.

2. In combination with the notched legs c and plain legs g, the clampslo and t' and oamleverj ,substantially as described and set forth.

3. The combination of the casting` (t, shoes b, 55

' bolts d, axle @,beam o, legs c, and brace f, substantially as shownand described.

GUSTAV HANSSEN.

Titnessesz HENRY MEYER, FREDK. GoTTscHALK.

